Summit Racing oil

33IMP said
I avoid synthetic if possible. Maybe it's the old "synthetic causes oil leaks in older engine gaskets", or the fact that a friend who owned a rearend shop warranteed synthetic in rearends for six seconds or six inches, whichever came first.
Maybe it's the fact it's more expensive for no perceived benefit (to me).
I use it in the Camaro ss cause it's required. I have found no need for it elsewhere.

The “synthetic cause oil leaks” has been wrong since at least the late 1980’s. There may be some cheap(r) synthetics that attack oil seals but none of the quality oils (oils that you can’t buy off the shelf at the local parts stores and are actually synthetics) attack oil seals.

To find the value in synthetics you have to test them. And that is incredibly expensive to do.